mf_wcomp.c
上传用户:romrleung
上传日期:2022-05-23
资源大小:18897k
文件大小:3k
- /* Copyright (C) 2000 MySQL AB
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
- /* Funktions for comparing with wild-cards */
- #include "mysys_priv.h"
- /* Test if a string is "comparable" to a wild-card string */
- /* returns 0 if the strings are "comparable" */
- char wild_many='*';
- char wild_one='?';
- char wild_prefix=0; /* QQ this can potentially cause a SIGSEGV */
- int wild_compare(register const char *str, register const char *wildstr,
- pbool str_is_pattern)
- {
- char cmp;
- DBUG_ENTER("wild_compare");
- while (*wildstr)
- {
- while (*wildstr && *wildstr != wild_many && *wildstr != wild_one)
- {
- if (*wildstr == wild_prefix && wildstr[1])
- {
- wildstr++;
- if (str_is_pattern && *str++ != wild_prefix)
- DBUG_RETURN(1);
- }
- if (*wildstr++ != *str++)
- DBUG_RETURN(1);
- }
- if (! *wildstr )
- DBUG_RETURN(*str != 0);
- if (*wildstr++ == wild_one)
- {
- if (! *str || (str_is_pattern && *str == wild_many))
- DBUG_RETURN(1); /* One char; skip */
- if (*str++ == wild_prefix && str_is_pattern && *str)
- str++;
- }
- else
- { /* Found '*' */
- while (str_is_pattern && *str == wild_many)
- str++;
- for (; *wildstr == wild_many || *wildstr == wild_one; wildstr++)
- if (*wildstr == wild_many)
- {
- while (str_is_pattern && *str == wild_many)
- str++;
- }
- else
- {
- if (str_is_pattern && *str == wild_prefix && str[1])
- str+=2;
- else if (! *str++)
- DBUG_RETURN (1);
- }
- if (!*wildstr)
- DBUG_RETURN(0); /* '*' as last char: OK */
- if ((cmp= *wildstr) == wild_prefix && wildstr[1] && !str_is_pattern)
- cmp=wildstr[1];
- for (;;str++)
- {
- while (*str && *str != cmp)
- str++;
- if (!*str)
- DBUG_RETURN (1);
- if (wild_compare(str,wildstr,str_is_pattern) == 0)
- DBUG_RETURN (0);
- }
- /* We will never come here */
- }
- }
- DBUG_RETURN (*str != 0);
- } /* wild_compare */